To better unite the nation, india is improving its

highway system
cottage industries
shipping economy
caste system

Caste system and people of lower castes are being given grants to fund education, housing and quality of life

caste system,

Explanation:

Caste system prevails only in the Indian and the African countries and this is a serious blockage to the road of development as the country had quite a shady past in the recent periods. Due to the violence and the turbulence that is created due to the movement of the population from their lands and the creation of the minority group of people are adding to the problem if the reservations and grabbing of the various post in the governmental organizations.  Many states are considered as a vote bank based on the caste population in the govt should abolish this cast's rights and make all equal as per the law and order.

It is c. naturally in the environment